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nikdorinn [45]
2 years ago
10

HELP HELP HELP HELP PLEASE

Mathematics
2 answers:
wolverine [178]2 years ago
5 0

Answer:

2

Step-by-step explanation:

6^2  - 36 ÷ 3^2 x 4 -18

Using BODMAS -Brackets, Of, Division/Multiplication, Addition/Subtraction.

=36 -(36 ÷ 9) x 4 -18

=36 - 4 x 4 -18

=36 -16-18

=2

Lelechka [254]2 years ago
3 0

Answer:

2

Step-by-step explanation:

Following the order of operations as set out in PEMDAS

6² - 36 ÷ 3² × 4 - 18 ( no parenthesis so evaluate exponents )

= 36 - 36 ÷ 9 × 4 - 18 ( multiplication/ division, evaluate from left to right )

= 36 - 4 × 4 - 18

= 36 - 16 - 18

= 20 - 18

= 2

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Decrease £16870 by 3% Give your answer rounded to 2 Decimal places​ please hurry im in a rush!!
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Answer:

$16,363.9

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8 0
3 years ago
Blake collects coins. he collected a total of 150 coins. if 84% of the coins he collected were foreign,
Alekssandra [29.7K]

Answer:

Step-by-step explanation:

84% of 150=126 (foreign coins)

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2 years ago
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3 years ago
A plane can fly 540 miles with the wind in one hour less than it can fly 480 miles against the wind. The average wind speed is 3
Bess [88]

Answer:

The speed of the plane in still air = 150 mph

Step-by-step explanation:

This is a relative velocity question

Let the velocity of the plane in still air be v

And let the time the plane can fly 480 miles against the wind be t

(Velocity of the plane relative to the wind) = (velocity of plane) - (velocity of wind)

Flying against the wind

(Velocity of plane relative to the wind) = (480/t)

(Velocity of the plane) = v

(Velocity of the wind) = 30 mph

(480/t) = v - 30

t = 480/(v-30) (eqn 1)

Flying with the wind

(Velocity of plane relative to the wind) = 540/(t-1)

(Velocity of the plane) = v

(Velocity of the wind) = -30 mph

540/(t - 1) = v + 30

t - 1 = 540/(v+30) (eqn 2)

Since t is equal in both cases, substitute the value of t in eqn 1 into eqn 2.

[480/(v-30)] - 1 = [540/(v+30)]

Multiply through by (v+30)(v-30)

480(v+30) - [(v+30)(v-30)] = 540(v-30)

480v + 14400 - (v² - 900) = 540v - 16200

480v + 14400 - v² + 900 = 540v - 16200

v² + 540v - 480v - 16200 - 14400 - 900 = 0

v² + 60v - 31500 = 0

Solving the quadratic equation,

v = 150 mph or v = -210 mph

We'll pick the positive answer because of the directions we have established.

Therefore, the speed of the plane in still air = 150 mph

Hope this Helps!!!

3 0
3 years ago
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